Marie Belle Breguet, a genius engineer of 'Meister Guild', was dispatched to investigate the abnormality of the Kyoto Core Tower, but to detect the suspicious movement of the military. Meanwhile, crown came to Naoto high school as a transfer student. School is making a fuss about the combination of NaoTou and Bishojo cousin!

Marie who encountered a crown that should have broke down moves. Knowing that the crown was repaired is Naoto and offer cooperation to avoid purging in Kyoto. And while heading for the core tower, Mary noticed the existence of a masterpiece trying to kill herself ....

I heard that crown sister sleeping in the basement and decided to cooperate Nao. I finally infiltrated the deep part of the core tower and I worked hard, but the purge time was approaching moment by moment. Meanwhile, Naoto will be forced to make a big decision that may lose the crown -!

In order to save the people from the giant weapon, Naoto and Marie become terrorists and take over the Akihabara Grid. In the now empty city, the army clashes with the giant weapon while RyuZU faces off with her weaponized sister AnchoR...